A recording from beginning to end of a continuous blank groove on a 1940s-era 12-inch 78 rpm test record, including the needle catching the outer groove at the beginning, and resting in the inner groove loop at the end.
A pad i created a few years back. If you decide to use this, credit me using the name, samtrobson. Happy to make my first contribution, i will add some more pads when i find them.